From: Wright Feng wright.feng@cypress.com
[ Upstream commit 2aca4f3734bd717e04943ddf340d49ab62299a00 ]
When firmware hit trap at initialization, host will read abnormal max_flowrings number from dongle, and it will cause kernel panic when doing iowrite to initialize dongle ring. To detect this error at early stage, we directly return error when getting invalid max_flowrings(>256).
Signed-off-by: Wright Feng wright.feng@cypress.com Signed-off-by: Chi-hsien Lin chi-hsien.lin@cypress.com Signed-off-by: Ian Lin ian.lin@infineon.com Signed-off-by: Kalle Valo kvalo@kernel.org Link: https://lore.kernel.org/r/20220929031001.9962-3-ian.lin@infineon.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c index b5d2e5b9f67c..8d4512c7181e 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c @@ -1109,6 +1109,10 @@ static int brcmf_pcie_init_ringbuffers(struct brcmf_pciedev_info *devinfo) BRCMF_NROF_H2D_COMMON_MSGRINGS; max_completionrings = BRCMF_NROF_D2H_COMMON_MSGRINGS; } + if (max_flowrings > 256) { + brcmf_err(bus, "invalid max_flowrings(%d)\n", max_flowrings); + return -EIO; + }
if (devinfo->dma_idx_sz != 0) { bufsz = (max_submissionrings + max_completionrings) *